The 30-year-old actress said the couple at times sport a white T-shirt and jeans for a dinner date, reported E!Online.
"I'll tell you-we have a thing called white T-shirt night and it's when you wear jeans and a white T-shirt and you go on a date," Kunis said.
"Nothing fancy, it's just something that you love to do. And whether that's bowling or dinner or going to a cheese shop and have some wine or walking around. I think that's just the best thing to do-and sometimes it's just nice to stay home," she added.